Conjectures and Refutations: 8 key ideas
The core ideas of Conjectures and Refutations, each in under a minute, written in our own words. Want the full depth? Get the book.
- IDEA 1 OF 8
Knowledge grows by guess and test
Popper argues that knowledge grows through conjectures, bold attempts to explain the world, and refutations, attempts to prove them wrong.
Learning from mistakes is the engine of progress. Criticism is welcome.
- IDEA 2 OF 8
Einstein took a real risk
Popper was impressed when Einstein's theory of relativity predicted that light would bend near the sun.
The 1919 eclipse observations could have disproved the theory, which made it genuinely scientific.
- IDEA 3 OF 8
Some theories explain everything
Popper contrasts Einstein's theory with Freud's psychoanalysis, Adler's psychology and Marxism.
These theories seemed to explain every possible case, which Popper saw as a weakness, not a strength. Nothing could prove them wrong.
- IDEA 4 OF 8
Confirmations are too easy
Popper argues that it is easy to find confirmations for almost any theory if we look for them.
What matters is whether the theory could be refuted. Only risky predictions count.
- IDEA 5 OF 8
Criticism is rational
Popper calls his view critical rationalism: we should hold beliefs open to criticism and test them.
Rationality means being willing to change our minds. Holding beliefs open to challenge is the mark of a rational mind.
- IDEA 6 OF 8
Traditions can be criticised
Popper argues that traditions are valuable starting points but should be open to criticism.
A critical tradition encourages debate and improvement. Respect for the past need not mean blind obedience to it.
- IDEA 7 OF 8
Theories can approach truth
Popper discusses verisimilitude, the idea that some theories are closer to the truth than others.
Even false theories can be better or worse. Progress can be real even without certainty.
- IDEA 8 OF 8
We learn from errors
Popper concludes that admitting mistakes and learning from them is the key to knowledge.
Science advances by correcting its errors. Error, honestly faced, is a teacher rather than a disgrace.
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